130 lines
5.1 KiB
Erlang
130 lines
5.1 KiB
Erlang
%% @author Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
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%% @copyright (C) 2009-2011 Bart Van Der Meerssche
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%%%
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%%% This program is free software: you can redistribute it and/or modify
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%%% it under the terms of the GNU General Public License as published by
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%%% the Free Software Foundation, either version 3 of the License, or
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%%% (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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%%% GNU General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program. If not, see <http://www.gnu.org/licenses/>.
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%%%
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%% @doc Flukso API: /sensor/xyz resource specification
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-module(flukso_sensor_xyz).
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-author('Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>').
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-export([init/1,
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allowed_methods/2,
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malformed_request/2,
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is_authorized/2,
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content_types_provided/2,
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to_json/2,
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process_post/2]).
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-include_lib("webmachine/include/webmachine.hrl").
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-include("flukso.hrl").
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init([]) ->
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{ok, undefined}.
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% debugging
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%init(Config) ->
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% {{trace, "/tmp"}, Config}.
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allowed_methods(ReqData, State) ->
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{['POST', 'GET'], ReqData, State}.
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malformed_request(ReqData, State) ->
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case wrq:method(ReqData) of
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'POST' -> malformed_POST(ReqData, State);
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'GET' -> malformed_GET(ReqData, State)
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end.
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malformed_POST(ReqData, _State) ->
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{_Version, ValidVersion} = check_version(wrq:get_req_header("X-Version", ReqData), wrq:get_qs_value("version", ReqData)),
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{RrdSensor, ValidSensor} = check_sensor(wrq:path_info(sensor, ReqData)),
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State = #state{rrdSensor = RrdSensor},
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{case {ValidVersion, ValidSensor} of
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{true, true} -> false;
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_ -> true
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end,
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ReqData, State}.
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malformed_GET(ReqData, _State) ->
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{_Version, ValidVersion} = check_version(wrq:get_req_header("X-Version", ReqData), wrq:get_qs_value("version", ReqData)),
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{RrdSensor, ValidSensor} = check_sensor(wrq:path_info(sensor, ReqData)),
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{RrdStart, RrdEnd, RrdResolution, ValidTime} = check_time(wrq:get_qs_value("interval", ReqData), wrq:get_qs_value("start", ReqData), wrq:get_qs_value("end", ReqData), wrq:get_qs_value("resolution", ReqData)),
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{RrdFactor, ValidUnit} = check_unit(wrq:get_qs_value("unit", ReqData)),
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{Token, ValidToken} = check_token(wrq:get_req_header("X-Token", ReqData), wrq:get_qs_value("token", ReqData)),
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{JsonpCallback, ValidJsonpCallback} = check_jsonp_callback(wrq:get_qs_value("jsonp_callback", ReqData)),
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State = #state{rrdSensor = RrdSensor,
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rrdStart = RrdStart,
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rrdEnd = RrdEnd,
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rrdResolution = RrdResolution,
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rrdFactor = RrdFactor,
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token = Token,
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jsonpCallback = JsonpCallback},
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{case {ValidVersion, ValidSensor, ValidTime, ValidUnit, ValidToken, ValidJsonpCallback} of
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{true, true, true, true, true, true} -> false;
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_ -> true
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end,
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ReqData, State}.
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is_authorized(ReqData, State) ->
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case wrq:method(ReqData) of
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'POST' -> is_auth_POST(ReqData, State);
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'GET' -> is_auth_GET(ReqData, State)
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end.
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is_auth_POST(ReqData, State) ->
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{true, ReqData, State}.
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is_auth_GET(ReqData, #state{rrdSensor = RrdSensor, token = Token} = State) ->
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{data, Result} = mysql:execute(pool, permissions, [RrdSensor, Token]),
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{case mysql:get_result_rows(Result) of
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[[62]] -> true;
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_Permission -> "access refused"
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end,
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ReqData, State}.
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content_types_provided(ReqData, State) ->
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{[{"application/json", to_json}], ReqData, State}.
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to_json(ReqData, #state{rrdSensor = RrdSensor, rrdStart = RrdStart, rrdEnd = RrdEnd, rrdResolution = RrdResolution, rrdFactor = RrdFactor, jsonpCallback = JsonpCallback} = State) ->
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case wrq:get_qs_value("interval", ReqData) of
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"night" -> Path = "var/data/night/";
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_Interval -> Path = "var/data/base/"
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end,
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%% debugging: io:format("~s~n", [erlrrd:c([[Path, [RrdSensor|".rrd"]], "AVERAGE", ["-s ", RrdStart], ["-e ", RrdEnd], ["-r ", RrdResolution]])]),
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case erlrrd:fetch(erlrrd:c([[Path, [RrdSensor|".rrd"]], "AVERAGE", ["-s ", RrdStart], ["-e ", RrdEnd], ["-r ", RrdResolution]])) of
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{ok, Response} ->
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Filtered = [re:split(X, "[:][ ]", [{return,list}]) || [X] <- Response, string:str(X, ":") == 11],
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Datapoints = [[list_to_integer(X), round(list_to_float(Y) * RrdFactor)] || [X, Y] <- Filtered, string:len(Y) /= 3],
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Nans = [[list_to_integer(X), list_to_binary(Y)] || [X, Y] <- Filtered, string:len(Y) == 3],
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Final = mochijson2:encode(lists:merge(Datapoints, Nans)),
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{case JsonpCallback of
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undefined -> Final;
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_ -> [JsonpCallback, "(", Final, ");"]
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end,
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ReqData, State};
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{error, _Reason} ->
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{{halt, 404}, ReqData, State}
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end.
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process_post(ReqData, #state{rrdSensor = RrdSensor} = State) ->
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{true , ReqData, State}.
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